Containers

`.container` enable a centered viewport.
`.container-fluid` enable a `100%` layout.

<body>
  <main class="container"></main>
</body>

Pico uses the same breakpoints and viewports sizes as Bootstrap.

Device	Extra small	Small	Medium	Large	Extra large
Breakpoint	<576px	≥576px	≥768px	≥992px	≥1200px
Viewport	100%	540px	720px	960px	1140px

<header>, <main> and <footer> as direct children of <body> provide a responsive vertical padding

<section> provides a responsive margin-bottom to separate your sections.